/*
 * Copyright (C) 2017-2019 Dremio Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dremio.resource;

import com.dremio.resource.common.ResourceSchedulingContext;

/**
 * select and return engine after evaluating rules against the current query context
 */
public interface RuleBasedEngineSelector {

  public String resolveAndUpdateEngine(ResourceSchedulingContext queryContext);

  /**
   * NO_OP implementation
   */
  public static final RuleBasedEngineSelector NO_OP = new RuleBasedEngineSelector() {

    @Override
    public String resolveAndUpdateEngine(ResourceSchedulingContext queryContext) {
      return null;
    }
  };

}
